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A Measuring Method for Improving the Accuracy of Brazing Bonding Rate in Ultrasonic Nondestructive Testing
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A technology of non-destructive flaw detection and measurement method, which is applied in the direction of using sound wave/ultrasonic wave/infrasonic wave to analyze solids, etc. It can solve problems such as measurement error of brazing rate, difficulty in non-brazing area, inaccuracy, etc., so as to improve accuracy and eliminate safety The effect of avoiding hidden dangers and avoiding waste
Active Publication Date: 2017-12-05
SHANGHAI HIWAVE PRECISION INSTR CO LTD
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Its disadvantage is: due to the existence of the threshold value, when the pixels of the unwelded points in the scanned image have little difference or great difference above the threshold value, the soldering rate obtained is the same, which is obviously unreasonable
The shortcoming of this invention is that there are certain difficulties and inaccuracies when determining the non-brazing area, and there is a certain error in the measurement of the brazing rate
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Embodiment 1
[0023] Example 1, the electrical contact of a low-voltage electrical appliance was measured for its brazing rate.
[0024] The steps of measurement are as follows:
[0025] Step 1: Carry out C-scanning of ultrasonic non-destructive testing: First, the ultrasonic testing equipment performs C-scanning of ultrasonic non-destructive testing on the electrical contact welding layer point by point along the serpentine trajectory, and obtains the C-scanning image in BMP format or JPG format and stores it in the computer;
[0026] Step 2: Image recognition: Carry out image recognition on the C-scan image, and the image recognition area is the entire welding layer area.
[0027] Step 3: Process the image of the entire welding layer area: perform grayscaleprocessing on the entire C-scan image, and quantify it into L-level grayscale, which is determined as L=256 here, and obtain the grayscale value f of each scanning point (x,y) .
[0028] Step 4: Determine the defect threshold f of th...
Embodiment 2
[0034] Example 2, measuring the brazing rate of an electrical contact of a low-voltage electrical appliance.
[0035] The steps of measurement are as follows:
[0036] Step 1: Carry out C-scanning of ultrasonic non-destructive testing: First, the ultrasonic testing equipment performs C-scanning of ultrasonic non-destructive testing on the electrical contact welding layer point by point along the serpentine trajectory, and obtains the C-scanning image in BMP format or JPG format and stores it in the computer;
[0037] Step 2: Carry out image recognition on the C-scan image, and the image recognition area is the entire welding layer area.
[0038] Step 3: Process the image of the entire welding layer area: perform grayscale processing on the entire C-scan image, and quantify it into L-level grayscale, which is determined as L=256 here, and obtain the grayscale value f of each scanning point (x,y) .
[0039] Step 4: Determine the defect threshold f of the C-scan image th , thr...
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Abstract
The invention relates to a measurement method for improving the accuracy of ultrasonic nondestructive testingbrazing rate. The steps are: performing ultrasonic nondestructive testing C-scan image recognition; performing grayscaleprocessing on the entire C-scanning image; determining the threshold value of ultrasonic brazing rate; calculating the entire The brazing rate of the solder layer area. The present invention takes into account the existence of the threshold value, and takes into account the contribution of pixels with a gray level greater than the threshold value to the measurement of the bonding rate, greatly improving the measurement accuracy of the bonding rate, and preventing the misjudgment of qualified parts as out-of-tolerance products Or misjudgment of out-of-tolerance products as qualified products, avoiding waste and eliminating potential safety hazards.
Description
technical field [0001] The invention belongs to the technical field of brazing effect detection, and in particular relates to a measurement method for improving the accuracy of the brazing adhesion rate of ultrasonic nondestructive testing. Background technique [0002] Ultrasonic testing is a commonly used detection method for the welding quality of the welding layer of electrical contacts, and the brazing rate is an important parameter to measure the quality of brazing. The traditional ultrasonic flaw detection brazing rate measurement method is to first perform ultrasonic flaw detection C-scan on the welding area to obtain the C-scan image of the welding area. The brazing rate is the ratio of the actual welding area to the theoretical welding area, and the theoretical welding area is the entire weld. The actual welding area is obtained by converting the ultrasonic C-scan image into a pseudo-color image with 256 grayscale values, and calculating the C-scan image according ...
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